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how long would it take to drive around the moon's equator at 80 km perm hour
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- The two daily high tides are due mainly to which of the following? (17.2) (a) the Earths rotational force lifting the ocean water away from the solid Earth (b) the differential gravitational attraction by the Moon because of the inverse-square relationship (c) gravitational forces between the Sun and the Earth (d) none of the precedingWhich of the following is true for an observer at 20N? (15.5) (a) always looks south to see the Sun (b) observes the Sun directly overhead twice a year (c) is near the Tropic of Capricorn (d) none of theseAs seen from above the Earths North Pole, the Moons orbit is counterclockwise. Use a coordinate system with the positivez axis pointing north. Find the magnitude and direction of the Moons angular velocity. Hint: Draw a sketch of the Moons orbit from this perspective above the North Pole, including thecoordinate system.
- Arrange the following motions in order of increasing velocity: orbit of Earth around the Sun; an orbit around Earth near Earths surface; an object just barely escaping Earth; orbit of the Moon around Earth; orbit of a geosynchronous satelliteToday at the beach you see the highest of all high tides during the last month. You see the Moon in the daytime sky. What is the most likely Moon phase? Why?Astrology makes much of the position of the planets at the moment of one’s birth. The only known force a planet exerts on Earth is gravitational. (a) Calculate the gravitational force exerted on a 4.20-kg baby by a 100-kg father 0.200 m away at birth (he is assisting so he is close to the child). (b) Calculate the force on the baby due to jupiter if it is at its closest distance to Earth, some 6.291011m away. How does the force of Jupiter on the baby compare to the force of the father on the baby? Other objects in the room and the hospital building also exert similar gravitational forces. (Of course, there could be an unknown force acting, but scientists first need to be convinced that there is even an effect, much less that an unknown force causes it.)
- Why do the heights of the tides change over the course of a month?Calculate the values of g at Earth’s surface for the following changes in Earth’s properties: (a) its mass is doubled and its radius is halved; (b) its mass density is doubled and its radius is unchanged; (c) its mass density is halved and its mass is unchanged.A high tide is occurring at Charleston, South Carolina (33N, 84W). (a) What other longitude is also experiencing a high tide? (b) What two longitudes are experiencing low tides?
- A planet has two moons with identical mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r. The magnitude of the gravitational force exerted by the planet on Moon 2 is (a) four times as large (b) twice as large (c) the same (d) half as large (e) one-fourth as large as the gravitational force exerted by the planet on Moon 1.Imagine you are a travel agent in the next century. An eccentric billionaire asks you to arrange a “Guinness Book of Solar System Records” kind of tour. Where would you direct him to find the following (use this chapter and Appendix F and Appendix G): A. the least-dense planet B. the densest planet C. the largest moon in the solar system D. excluding the jovian planets, the planet where you would weigh the most on its surface (Hint:Weight is directly proportional to surface gravity.) E. the smallest planet F. the planet that takes the longest time to rotate G. the planet that takes the shortest time to rotate H. the planet with a diameter closest to Earth’s I. the moon with the thickest atmosphere J. the densest moon K. the most massive moonWhy should the eccentricity of Earth’s orbit make winter in the Northern Hemisphere different from winter in the Southern Hemisphere?
